Effect of exercise on Effect of exercise on breathingbreathing

Objectives

• Explain why breathing and pulse rates increase during exercise

• Know what happens in respiration

• Remember the equation for respiration

• Know about anaerobic respiration

Do not write this unless you are a fast writer

I will post this slideshow on http://griggans.edublogs.org

Keywords

• Tidal volume• Vital capacity• Spirometer• Aerobic• Anaerobic• Respiration• Lactic acid• Oxygen debt• Fatigue

You need to write

these down

Starter

• Count the number of breaths you take in one minute while at rest

• Write this number down• Now walk around or do some light exercise for

one minute• Immediately take your breathing rate again• What happens?• Why? (explain scientifically – don’t say it’s

because you smoke!)

Measuring Lung Volume

Write down the volume of air you breathe out normally . This is your tidal volume

Write down the volume of air you have forced out of your lungsThis is your vital capacity

An asthmatic can have their vital capacity measured with a peak flowpeak flow meter

This volume =

This volume =

You cannot breathe out all the air in your lungs – there is still a residual volume residual volume left

Spirometer Trace

Why do the breathing rate and pulse rate need to increase with exercise?

To supply more oxygen

Oxygen is needed for aerobic respiration

Respiration releases energy

AerobicAerobic respiration is respiration using oxygenoxygen

The role of the brainbrain in all of this

• The brain monitors the amount of carbon dioxide in the blood

• If this gets too high it sends signals to make the lungs breathe faster to get rid of this poisonous carbon dioxide

What is the equation for aerobicaerobic respiration?

C6H12O6 + 6O2 → 6CO2 + 6H2O (+ energy)

What is anaerobicanaerobic respiration?

• In a sprint, you cannot breathe fast enough.• Respiration takes place without oxygen• Energy is still released, but much less • Lactic acidLactic acid is made• This is poisonous and causes cramp• Oxygen needs to be paid back to remove the

lactic acid• This is called the oxygen debt oxygen debt ( watch sprinters

after a race gasping for air to repay their debt)

What is the equation for anerobicanerobic respiration?

glucose → lactic acid + some energy

Plenary

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